There is some element of surprise, but rather at the beginning of a scene than at the end of it. Then it's a matter of "how far can you take this situation", e.g. a knight losing all limbs and still claiming "it's just a scratch" (Sorry for the spoiler but it's been 48,5 years...).
Part of it could also be missing cultural context. Taking the same scene as example, it's a comment on the British "stiff upper lip".
Or in other words, it was designed for people in Britain who went through a British education of the time.
I really liked it in my early 20's, but I've found that my taste for silly / absurdist comedy has diminished over the years.
(For my part, I’ve seen every Python movie and TV episode.)